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Surface plasmon resonance refractive index sensor based on photonic crystal fiber covering nano-ring gold film

机译：基于光子晶体纤维覆盖纳米环金膜的表面等离子体共振折射率传感器

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摘要

We propose a tunable wide-range surface plasmon induced refractive index optical sensor based on photonic crystal fiber (PCF) covered nano-ring gold film. The free electrons on the gold surface will resonate with photons to excite the attenuation and transmission of surface plasmon waves on the metal surface, when the vibrational frequencies of photons and electrons are the same. The refractive index analytes are very sensitive to SPR, which will be applied to PCF refractive index sensors. The finite element method (FEM) is used to analyze and simulate the sensing performance of the refractive index sensor. A kind of refractive index analyte is infiltrated into the outermost air holes of cladding. However, the resonance coupling between the fundamental mode and surface plasmon polariton (SPP) mode happens when the phase matching condition is matched. The resonance wavelength for 1st and 3rd peaks dependence on the refractive index analyte follows polynomial fitting law, and their fitness are 0.99605 and 0.99623, respectively. When the range of refractive index is from 1.33 to 1.39 and 1.40 to 1.43, the dependence of the resonant wavelength on the refractive index of the analyte follows a linear law and exhibits a relatively high sensitivity.
机译：我们提出了一种基于光子晶体纤维（PCF）覆盖的纳米环金膜的可调宽范围表面等离子体诱导折射率光学传感器。当光子和电子的振动频率相同时，金表面上的自由电子将与光子共振以激发表面等离子体波在金属表面上的衰减和透射。折射率分析物对SPR非常敏感，这将应用于PCF折射率传感器。有限元方法（FEM）用于分析和模拟折射率传感器的感测性能。一种折射率分析物被渗透到包层的最外面的空洞中。然而，当相位匹配条件匹配时，发生基本模式和表面等离子体（SPP）模式之间的谐振耦合。第1和第3峰依赖于折射率分析物的共振波长遵循多项式拟合法，它们的适应度分别为0.99605和0.99623。当折射率范围为1.33至1.39和1.40至1.43时，谐振波长对分析物的折射率的依赖性遵循线性定律，并且表现出相对高的灵敏度。

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